Definición de Plecoptera en inglés:

plural sustantivo

Hedriumichnus may therefore have been produced by a nymph of a primitive Ephemeroptera (Mayflies; the lobes representing abdominal leglets), or Plecoptera (Stoneflies; the lobes representing globular gills).

One small brown insect that I first thought might be some type of Plecoptera or Neuroptera quickly revealed itself to be a webspinner (Embioptera).

Hedriumichnus, known only from the Robledo Mountains, is interpreted as the resting trace of a nymph of a primitive Ephemeroptera or Plecoptera.